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HomeAircraftHelicopterHelicopter Main Discussion › OS 105 carb questions
11-02-2017 11:17 PM  13 months agoPost 1
Jeff polisena

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westpalmbeachflorida usa

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Im not a fan of pressurized tank... so my question is can I use muffler pressure with regulated carb or do I need new carb . Im good at tuning both carbs just don't like to open tank every time I want to fuel .

I stole it ,flew it and gave it back ;)

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11-03-2017 12:51 AM  13 months agoPost 2
EEngineer

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TX

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To answer your question.....

NO!

You must use the engine's pressurization system!

And, if you don't like it.....try another type of OS engine.

That engine is designed to use that particular carb for best results.

Logo 600SXs, 800XX, TDR IIs

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11-03-2017 02:07 AM  13 months agoPost 3
Jeff polisena

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westpalmbeachflorida usa

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I can replace carb and back plate . Was just wondering about a quick fix until new motor is in . I’ll leave it until I can do it rite .

I stole it ,flew it and gave it back ;)

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11-03-2017 02:16 AM  13 months agoPost 4
EEngineer

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TX

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I suppose you could, but.....just curious...

Why would you get a $500+ OS engine like that one....and then
alter it from how it was designed to operate....and expect equal results.

The pressure system, like that of a YS engine, is designed for a carb with an oversized venturi......for more air intake while maintaining adequate fuel flow that can't be accomplished by the normal "venturi" effect.

So, after spending $500(assuming a new engine), then you spend even more for another substandard carb and another backplate.

I just don't understand....

Logo 600SXs, 800XX, TDR IIs

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11-03-2017 05:42 PM  13 months agoPost 5
Jeff polisena

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westpalmbeachflorida usa

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It was wrong shipment and the HZ was backorderd . The carb is same as 91HZ I was just going to bypass sealed tank but if others have tried and regulator won’t allow for tunning then I’ll order new motor . I have a couple coming anyways for other helis . I might just try for the heck of it .

I stole it ,flew it and gave it back ;)

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11-03-2017 06:40 PM  13 months agoPost 6
Flyin for Jesus

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Troy, IL. 62294

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Don't both muffler pressure and backplate pressure systems require a sealed fuel tank?
I have both and the only difference is the check valve with the backplate system.

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11-03-2017 06:52 PM  13 months agoPost 7
ticedoff8

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Morgan Hill, CA. USA

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Flyin for Jesus
Don't both muffler pressure and backplate pressure systems require a sealed fuel tank?
I have both and the only difference is the check valve with the backplate system.
Not really.
The 1-way check valve maintains the pressure in tank even without the engine running. One way to tell if you have a bad regulator is if there is no "whoosh" of pressure release when you open the tank's vent to refill with fuel.
And, the pressure from the crankcase is higher then what the pipe/muffler can produce.

If you decide to change to a HZ carb and start using pipe/muffler pressure, you may sacrifice a little low-RPM torque.
But there are quite a few people that like the HZ more than the HZ-R motors because they seem to be easier to tune and they tend to stay in-tune without "random" and hard to define changes in engine performance.

Personally, I use the YS motors and YS has no options to get non-regulated motors.

Believe 1/2 of what you see and none of what you hear.
Fake News will be the downfall of our Republic!

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11-03-2017 06:58 PM  13 months agoPost 8
EEngineer

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TX

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The "one way check valve" is the hydraulic equivalent to a diode.

It allows air(like a diode allows current) to flow in only one direction.

And by doing so, holds pressure that might want to flow the opposite direction.

Logo 600SXs, 800XX, TDR IIs

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11-03-2017 07:22 PM  13 months agoPost 9
dkshema

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Cedar Rapids, IA

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Why not just bite the bullet and hook it up properly? The system just works.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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11-03-2017 07:28 PM  13 months agoPost 10
Jeff polisena

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westpalmbeachflorida usa

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I know it’s a crazy reason to want muffler pressure being that I have HZ-R but having to pull off two stops to fill for some reason drives me crazy . I wish SAB still had the upgrade pressure release valves available .

I stole it ,flew it and gave it back ;)

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11-03-2017 07:28 PM  13 months agoPost 11
Flyin for Jesus

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Troy, IL. 62294

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I got ya, unhooking two lines to fill the tank instead of one.

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11-03-2017 07:44 PM  13 months agoPost 12
ICUR1-2

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Ottawa, Ontario

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i just use 2 fuel clamps 1 for the tank to release pressure( T connector) and 1 just before the carb I personally don't have a problem with this set up,

(using a ys 60 on a 600n)

spending time, paying attention

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11-03-2017 09:47 PM  13 months agoPost 13
Jeff polisena

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westpalmbeachflorida usa

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I don’t have any problems with the set up it’s working as it is supposed to . Building another Heli I’ll just build it with the 105 HZ when it’s off of backorder

I stole it ,flew it and gave it back ;)

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11-04-2017 01:47 PM  13 months agoPost 14
wjvail

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Meridian, Mississippi

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As others have suggested, the OS DRS is really a good system as it is designed.

Consider this, by eliminating exhaust gasses in your fuel system, your fuel lines and tank fitting will last decades longer. One of the real upsides to the DRS system is that it gets rid of nasty spent nitro gasses.

There are solutions to venting the tank for refueling but as you noted, all require an additional action that muffler pressure does not. My goto solution is to put a Tee fitting in the crankcase pressure line, run a line to outside the canopy and put stopper in the line for flight. To refuel, I simply pull the stopper to vent the tank. https://www.amainhobbies.com/sab-fu...h0715-s/p508728

"Well, nothing bad can happen now."

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11-04-2017 02:13 PM  13 months agoPost 15
wjvail

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Meridian, Mississippi

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I don’t have any problems with the set up it’s working as it is supposed to . Building another Heli I’ll just build it with the 105 HZ when it’s off of backorder
This might keep your build moving?
http://www.rcjapan.net/index.php?ma...oducts_id=11638

"Well, nothing bad can happen now."

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